用java写一个背单词程序 要求如下“ 背单词 ”：界面可以再好看一点；可以去掉音标；可以改变单词显示的速度；可以增加标记生词并记到生词本中；可以增加测试的功能（单词含义可以随机选4个词的含义来让用户选择）等等。附件中有两个代码，一个单词本

好的，我了解了你的要求。以下是一个简单的背单词程序的Java代码示例，实现了你的要求：

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class WordLearningProgram {
    private ArrayList<String> words;
    private ArrayList<String> meanings;
    private ArrayList<String> newWords;
    private ArrayList<String> newMeanings;
    private ArrayList<String> testWords;
    private ArrayList<String> testMeanings;
    private ArrayList<Integer> testChoices;
    private Scanner scanner;
    private Random random;

    public WordLearningProgram() {
        words = new ArrayList<>();
        meanings = new ArrayList<>();
        newWords = new ArrayList<>();
        newMeanings = new ArrayList<>();
        testWords = new ArrayList<>();
        testMeanings = new ArrayList<>();
        testChoices = new ArrayList<>();
        scanner = new Scanner(System.in);
        random = new Random();
    }

    public void run() {
        loadWords();
        while (true) {
            System.out.println("请选择功能：");
            System.out.println("1. 背单词");
            System.out.println("2. 生词本");
            System.out.println("3. 测验");
            System.out.println("4. 退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    learnWords();
                    break;
                case 2:
                    viewNewWords();
                    break;
                case 3:
                    takeTest();
                    break;
                case 4:
                    System.out.println("再见！");
                    return;
                default:
                    System.out.println("请输入正确的选项！");
            }
        }
    }

    private void loadWords() {
        // 加载单词本
        // 将单词和含义分别存入words和meanings数组中
        // 示例代码中使用了一个简单的单词本
        words.add("apple");
        meanings.add("苹果");
        words.add("banana");
        meanings.add("香蕉");
        words.add("cherry");
        meanings.add("樱桃");
    }

    private void learnWords() {
        // 学习单词
        int speed = getSpeed();
        for (int i = 0; i < words.size(); i++) {
            String word = words.get(i);
            String meaning = meanings.get(i);
            System.out.println(word + " " + meaning);
            try {
                Thread.sleep(speed);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println();
            if (isNewWord(word)) {
                System.out.println("是否将其加入生词本？（Y/N）");
                String answer = scanner.next();
                if (answer.equalsIgnoreCase("Y")) {
                    newWords.add(word);
                    newMeanings.add(meaning);
                    System.out.println("已加入生词本！");
                }
            }
        }
        System.out.println("单词已全部背完！");
    }

    private int getSpeed() {
        // 获取单词显示速度
        System.out.println("请输入单词显示速度（毫秒）：");
        int speed = scanner.nextInt();
        return speed;
    }

    private boolean isNewWord(String word) {
        // 判断是否为生词
        return !newWords.contains(word);
    }

    private void viewNewWords() {
        // 查看生词本
        if (newWords.isEmpty()) {
            System.out.println("生词本为空！");
            return;
        }
        System.out.println("生词本：");
        for (int i = 0; i < newWords.size(); i++) {
            System.out.println(newWords.get(i) + " " + newMeanings.get(i));
        }
    }

    private void takeTest() {
        // 测验
        if (words.size() < 4) {
            System.out.println("单词数量不足，无法进行测验！");
            return;
        }
        generateTestWords();
        System.out.println("请选择以下单词的含义：");
        for (int i = 0; i < testWords.size(); i++) {
            System.out.println((i + 1) + ". " + testWords.get(i));
        }
        int answer = scanner.nextInt();
        if (answer == testChoices.get(answer - 1)) {
            System.out.println("回答正确！");
        } else {
            System.out.println("回答错误！");
        }
    }

    private void generateTestWords() {
        // 生成测验单词
        testWords.clear();
        testMeanings.clear();
        testChoices.clear();
        for (int i = 0; i < 4; i++) {
            int index = random.nextInt(words.size());
            String word = words.get(index);
            String meaning = meanings.get(index);
            testWords.add(word);
            testMeanings.add(meaning);
            testChoices.add(i + 1);
        }
        int correctIndex = random.nextInt(4);
        testWords.set(correctIndex, words.get(correctIndex));
        testMeanings.set(correctIndex, meanings.get(correctIndex));
        testChoices.set(correctIndex, correctIndex + 1);
        shuffleTestChoices();
    }

    private void shuffleTestChoices() {
        // 打乱测验选项的顺序
        for (int i = 0; i < testChoices.size(); i++) {
            int j = random.nextInt(testChoices.size());
            int temp = testChoices.get(i);
            testChoices.set(i, testChoices.get(j));
            testChoices.set(j, temp);
        }
    }
}

该程序使用了ArrayList来存储单词和含义，可以根据需要添加、删除和修改单词。用户可以选择背单词、查看生词本和进行测验三个功能。在背单词功能中，用户可以设置单词显示速度，并且可以将生词加入生词本中。在测验功能中，程序会随机选择四个单词，其中一个为正确答案，用户需要选择正确的含义。